Hoisting mechanism.



Patented Aug. 5, 1913.

P. A. SKIFFQ HOISTING MECHANISM.

APBLIOATION FILED SEPT. 11, 1912.

FREDERIC A. SKIFF, OF PAXTON, MASSACHUSETTS.

HOISTING MECHANISM.

Specification of Letters Patent.

Application filed September 11, 1912.

Patented Aug. 5,1913.

Serial No. 719,885.

T 0 all whom it may concern Be it known that I, FREDERIO A. SIGN, a citizen of the United States, residing at Paxton, in the county of lVorcester and State of Massachusetts, have invented certain new and useful Improvements in Hoisting Mechanisms, of which the following is a specification.

This invention relates to hoists.

The primary object of the invention is to provide a hoisting mechanism in which the article to be lifted may be raised with a small amount of exertion on the part of the operator, the construction being such that one operator may position and manipulate the entire mechanism.

A further object of the invention is to provide a construction in which the lifting mechanism may be locked against movement at any desired height.

A still further object of the invention is to provide means whereby the pull is exerted in a direct vertical line.

In the drawings: Figure 1 is a perspective view; and Fig. 2 a detail view of the shaft which forms the winding drum.

In the drawings 10 designates a frame which consists of the beam 11 to which is bolted a beam 12, the terminals of the beam 12 being off-set. The terminal 14: of the beam 12 is bent to embrace the upper terminal of the beam 11, the terminal 16 of said beam being secured to the beam 11 in spaced relation with respect to its lower terminal 17. The-offsetting of the terminals of the beam 12 space the intermediate portions 18 and 19 of the beams 11 and 12, forming a housing for the gears 20 and 21. The smaller gear is mounted on a shaft 22, the terminal of which projects beyond the beam 12, the crank 24 being secured to said terminal. The major gear 20 which meshes with the gear 21 is mounted on the shaft 25. The portion of the shaft 25 which extends through the beams 11 and 12 is round in cross-section, the portion 26 of said shaft which constitutes the winding drum being square in cross section. A ring 29 is secured to the lower terminal 17 of the beam 12, the article lifted being connected to said ring. A ring 30 is secured adjacent the meeting upper terminals of the beams 11 and 12, the bolt 31 which supports the ring passing through the beams 11 and 12, its terminal remote from the beam 11 supporting a chain 32 which is provided with the hook 33. A chain 34, both terminals of which are provided with rings which prevent its being passed entirely through the ring 80, is connected at one of its ends with a suitable support, its other end being passed through the ring 30 and secured to the shaft 25. This chain is connected to the shaft 25 by passing one of its links between the bifurcations 25 of said shaft. These bifurcations are substantially triangular in cross section, and the apeXes of the triangles serve to prevent the displacement of the chain, contacting with the adjacent links.

\Vhen it is desired to lift an article which has been previously attached to the ring 29, the crank 24 is rotated causing the chain 3% to wind upon the shaft 25, thus the chain is shortened and the article is lifted, the winding of the chain on the shaft 25 causing the frame to travel on the chain 34. lVhile the device is shown as equipped with a crank for rotating the gears, it will be noted that a suitable mechanism may be employed to operate the gears from a point remote from the frame. When it is desired to stop the hoist with a load in position, the hook 33 of the chain 32 is either inserted in one of the links of the chain 34, or brought to a position to embrace the crank 24. It will be noted by this construction that the frame may be conveniently supported against movement even though the load be attached to its lower terminal.

Particular attention is called to the fact that although the actual winding of the chain occurs at a point out of vertical alinement with the frame, the ring 30 which is secured adjacent the upper terminal of the frame properly centers the weight with respect to the frame.

The many advantages of a construction of this character will be clearly apparent, as it will be noted that the same provides a mechanism which may be conveniently attached to a suitable support and to the article to be lifted.

It will be seen that the construction is such as may be easily and economically manufactured and that the various parts may be readily assembled. It will also be noted that the device provides a durable construction which will not readily get out of order and which will occupy but comparatively small space when not in use.

fiavii'ig described my invention, what I claim as new is:

A hoisting mechanism including a frame comprising spaced terminally connected members, shafts supported by said. members, a pinion mounted on one of said shafts, means for rotating said shafts, a gear mounted on the other shaft and n'ieshing with said pinion, a ring secured to the upper terminal of said frame, a securing device for said ring passing through the b ams which constitute the frame, a chain supported by said securing device, a lifting chain, said chain being passed through said ring and connected to said shaft, the chain which is supported by said securing device being adapted to engage the second chain to lock the frame against movement.

In testimony whereof I aflix my signature in presence of two witnesses.

FREDERIC A. SKIFF. [In s] \Vitnesses A. V. HEBBERD, CLAUDIOE A. HEBBERI).

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

